Light intensifying attachment for electric bulbs



Dec. 30, 1952 H. G. LEHMANN 2,623,989

LIGHT INTENSIFYING ATTACHMENT FOR ELECTRIC BULBS 2 SI-IEETS-QSI-IEET 1 Filed May 15, 1947 TOR.

Dec. 30, 1952 H. cs. LEHMANN 2,523,989

LIGHT INTENSIFYING ATTACHMENT FOR ELECTRIC BULBS 2 SHEETS-SHEET 2 Filed May 15, 1947 IN V TOR.

MAM,

Patented Dec. 30, 1952 LIGHT INTENSIFYING ATTACHMENT FOR ELECTRIC BULBS Herbert G. Lehmann, Bridgeport, Conn.

Application May 15, 1947, Serial No. 748,266

10 Claims.

This invention relates to light-intensifying attachments for electric light bulbs.

An object of the invention is to provide for use in the home an improved intensifying attachment for an electric light bulb, which attachment is universal in its application, being mountable on any of the various sizes and shapes of bulbs used in direct-light reading lamps, and being adjust- 2 an attachment as above, which when mounted on a bulb requires but little additional space, so that the attachment may be used in all types of direct-lighting lamps and shifted to any of a large number of adjusted positions without interfering with the shades or shade supports thereof.

able to a large variety of positions whereby light of increased intensity may be directed where desired or needed for reading, sewing, etc., regardless of whether the bulb of the lamp is in an upright or a depending position.

Another object of the invention is to provide an improved light-intensifying attachment which is extremely economical to manufacture and merchandise, the attachment being so arranged that it may be sold in compact knock-down form, the consumer doing the assembling of the components or parts, thereby saving the assembly cost in the manufacture, and the device when knocked-down being extremely compact, thereby saving counter space, storage sp-ace and reducing shipping charges.

A further object of the invention is to provide an improved light-intensifying attachment which is extremely efficient in collecting and directing light where needed.

A still further object of the invention is to provide a knock-down light-intensifying attach.- ment which is easy for even the least skilled consumer or user to assemble without mistake or error.

Yet another object of the invention is to provide a light-intensifying attachment as above, which lends itself to volume machine production at low unit cost, using low cost materials.

Still another object of the invention is to provide an improved attachment as above, which is easily adjustable to various positions, is sturdy and safe in use, and does not require attention i'ter installation, staying in any adjusted position to which it is moved.

A feature of the invention is the provision of an attachment as above, which is so arranged that relatively large manufacturing tolerances may be accommodated, thereby effecting a further economy in production.

A still further object of the invention is to provide an improved knock-down light intensifying attachment with removable clip means, the said attachment being so arranged that when it is mounted on a bulb the bulb pressure tends to maintain and lock the clip means to the lens part of the attachment.

Another object of the invention is to provide In accomplishing these objects there is provided by the invention a novel lens and clip structure, comprising a magnifying lens having specially shaped edge or peripheral portions, cooperable with a pair of separate resilient clips whereby the lens may be attached to a bulb in light-intensifying relation thereto.

The said cooperable edge portions of the lens are protuberant, being in the form of lugs having grooves therein which provide abutments or shoulders, and the clips, which are preferably of spring wire, have pairs of legs so shaped as to be removably attachable to the said lugs, and when attached, to coact to embrace a bulb envelope for supporting the lens thereon.

In one embodiment of the invention the clips comprise loops each carrying a pair of hooked legs, the loops being biased when the clips are attached to the lens, and the structure of the clips and lens, and the bias being such that the latter retains the clips in place against accidental dislodgement. The hooks of the legs closely fit and dovetail to the lugs so that the clips are firmly supported as if they were an integral part of the lens, and this greatly facilitates application of the attachment to a bulb. Moreover, when the device or attachment is in place on a bulb the clips are under substantial spreading pressure, and the bulb tends to spread the loops of the clips, thereby aiding the bias thereof and effectively locking the clips to the lens by a wedging and twisting action, against removal therefrom. This provides a safety factor which prevents inadvertent or accidental dislodgement of the device from the bulb.

However, in addition to this, the attachment of the clips to the lens is so simple and fool-proof that the device may be packed in knock-down condition, for assembly by the consumer. Since the bulk when not assembled is considerably less than when assembled, this results in a considerable saving of space, not only on the counter but in storage and in transit.

According to the arrangement provided, but three separate components or parts make up the entire device of this invention, two of the parts (constituting the clip means) being duplicates of each other. Also, the components arereadily produced by simple machine operations so as to be dropped-on from the machine complete, the

3 lens being molded, and the clips being bent from wire stock, and these factors together with the elimination of assembly operations due to the ease of assembly of the device by a consumer, result in a product which may be produced at an extremely economical and attractive price.

The clips and lens are so arranged that when the device is mounted on a bulb the additional space required is only that occupied by the lens since the clips hug the bulb and do not have any portions projecting beyond the extremities of the lens; therefore the device may be used without interference from existing shades on lamps, regardless of the operative position in which it is placed.

The lens is so proportioned that the intensification of rays of light produce at least double, and under favorable conditions, triple the light normally provided by an incandescent bulb, in a given reading or working area. To accomplish this and still provide a satisfactory, relatively large lighted working area and adequate clearance space for cooling, the area of the lens could not be reduced below a minimum predeterminet value, and the maximum thickness of the lens, at the center thereof, had to be held to a substantial value which precluded the lens being economically molded of a plastic material due to the considerable curing time required.

By the present invention, the lens is provided with protuberant portions or lugs so shaped, as illustrated in the embodiments of the invention, as to enable the clips to be readily and quickly attached after purchase of the device, while at the same time making possible the melding of 9 the lens in glass, which does not require a long curing time, and which is an inexpensive material, therefore resulting in further economy of manufacture.

The lugs are so arranged as to detract to the least extent from the effective lens area, thereby resulting in an extremely efficient light collecting device enabling the above-mentioned advantageous increases in light values to be obtained. With the above light requirements met in a glass lens, this component attains a relatively heavy Weight; however, the clip arrangement provided, and attaching means therefor including the lugs on the lens, enables the latter to be maintained in any of a large number of different adjusted angular and rotative positions on bulbs, regardless of gravitational attraction and regardless of variation in the size of the bulb envelopes as encountered in bulb sizes between 25 watts and 100 watts. the lens may be quickly shifted and directed at will, with little pressure being required.

According to the invention the lens part is provided with a deep recess or notch in its pe-- ripheral portion between the lugs, which together with the manner in which it is supported on the bulb envelope by the resilient clips, enables the lens to be shifted, by providing clearance for the neck of the bulb, so as to direct light past the base of the bulb in a direction having a minimum acute angle with the longitudinal axis of the bulb. The notch has sloping walls whereby it may closely fit the neck of the bulb in the manner of a collar part, and therefore a minimum amount of material is removed from the lens, resulting in light-collecting efficiency for the said shifted position of the lens. By this arrangement the lens be used to equal advantage in lamps having either up- Moreover, when desired 4 standing or depending bulbs, Whether table, floor, boudoir or other lamps.

The clip mounting means is so arranged that the lens may be adjustably carried on a bulb which is already carrying resilient loops supporting a lamp shade, and this is accomplished by placing the clips over or surrounding the loops of the shade.

Other features and advantages will hereinafter appear.

In the accompanying drawings:

Figure l is a side elevation of the light-1m tensifying attachment of this invention, mounted on an incandescent bulb carried by a table lamp, the lamp being shown in broken outlines.

Fig. 2 is a side elevation of the attachment. mounted on an upright incandescent bulb carried by a different type of table lamp, the lamp being shown in broken outlines.

Fig. 3 is a perspective view of the attachment in assembled state.

Fig, 4 is a plan view of one of the resilient wire clips of the attachment.

Fig. 5 is a section on line 5-5 of Fig. 4.

Fig. 6 is a plan view of the lens of the attachment.

Fig. 7 is a section on line 'l-l of Fig. 5.

Fig. 8 is a section on line 3--3 of Fig. 6.

Fig. 9 is a section on line 99 of Fig. 3.

Fig. 10 is a central section of an intensifying attachment made according to a modification of the invention.

Fig. 11 is a perspective view of one of the resilient clips of the attachment of Fig. 1G, and a portion of the lens, and

Fig. 12 is a perspective View of an intensifying attachment made according to another modification of the invention.

The improved light-intensifying attachmenu of the present invention, as illustrated in Figs. 1 through 9 sh wing one embodiment of the invention, comprises essentially a lens part iii and a pair of resilient mounting clips H detachably secured, in opposed. relation, to the lens part. The lens it and clips H are so arranged that the latter are quickl and easily secured to and removed from the lens, so that this operation may be performed by the consumer after purchase of the device, yet when in place the clips are very stoutly and firmly supported and cannot be accidentally dislodged or dislocated during application of the device to a bulb. Also, after such application, the pressure of the bulb on the clips acts to securely lock these in place on the lens. 7

Referring to Figs. 6, '7 and 8, the lens l0 consists of a transparent body l 2 having a planar surface 53 and an opposite convex surface l4. To obtain the advantageous mounting for the clips I! the body 52 of the lens is provided along its periphery with protuberant portions or lugs l5, grouped in pairs. Each lug it has a fiat surface it colinear with the planar surface E3 of the lens, and has an opposite flat surface 1? par allel with the surface it and meeting with a shoulder surface E23 by which it is joined to the convex surface as of the lens body. The surfaces 5'! of the lugs all lie in a common plane, and the shoulder surfaces 1 t extend along a common circle. The lugs it of each pair have generally fiat inner opposed surfaces is vhich are parallel to each other and vhich meet with the convex surface 24 of the body at a peripheral portion 29 located between" the pair.

Each pair of lugs 55 has outer side surfaces 2| comprising flat portions 22 (Fig. 9) and curved portions 23, the latter blending with the convex surface 14 of the lens body 12. The end surfaces 24 of the lugs of each pair are also generally flat and lie in a single plane,

In accordance with the invention each of the lugs I5 is provided with a pair of grooves 25 and 26 extending transversely thereof, the groove 25 being disposed in the flat surface 16 and the groove 26 in the flat surface I'i, thereby to form spaced shoulders or abutments. Referring to Fig. 9, and also to Fig. 8 it will be seen that the grooves of each individual lug lie in the same plane but are angularly disposed with respect to each other, being convergent in the direction of the adjacent or paired lug, and preferably the included angle between each pair of grooves is on the order of approximately 10. This angularity of the grooves of each pair is for the purpose of accommodating commercial tolerances in the lens NJ, as will be explained later in more detail.

The lens structure as outlined above enables the lens to be readily and economically molded of glass, by machine processes, and this is a particularly important factor in enabling the entire light-intensifying attachment to be produced and marketed at an attractively low figure, so as to place it in the volume sales group. A

consideration in accomplishing this is the absence of all holes and apertures, the elimination of undercut walls and all types of inserts, and the ability to cope with the relatively generous tolerances on dimensions required by fabricators of glass. Due to the relatively thick section at the center of the lens body 12 the cost of molding the lens in a plastic material such as Lucite (methyl methacrylate resin) would be considerably greater than when molding with glass, due in large part to the long curing time required by the thick section, and reduction of this section is not possible without detracting greatly from the light-intensification properties of the lens.

The lugs l are engageable and cooperable with the clips i l for the purpose of enabling the latter to be easily and quickly demountably secured to the lens 10. Referring to Figs. 1, 3, 4 and 5 the clips I I are identical to each other, and each clip comprises a body or loop portion 2'; having a generally circular shape, and comprises legs 28 extending outwardly from the ends of the loop portion. At their ends the legs 28 have hooks 29, each hook comprising opposite arms 353 and 3% connected together by a yoke or connector portion 32. As seen in Fig. 4 the arms 30 of the hooks are longer than the arms SI, and are preferably not quite parallel therewith, the included 1 angles between them being on the order of approximately Also, the loop or body portion of the clip extends in an arc of approximately 270, and the legs 2% if extended toward the center of the body would intersect at approximately 90. Referring to Fig. 5, each leg 28 makes an angle with the plane of the body 21 on the order of approximately to", and makes an angle with the plane of the hook carried by it, of approximately 120. The clips i i are made of resilient Wire stock, preferably spring steel.

As shown in Figs. 2, 3 and 9, the hooks 23 of the clips I i may be hooked on the lugs E5 of the lens It, the arms 3! of the clips occupying the grooves 26 in the lugs, and the longer arms 30 of the clips occupying the grooves in the lugs. ihe yoke portions 32 of the hooks extend between the lugs of the pairs, overlying the surfaces IQ of the lugs.

In applying the clips I l to the lugs i5, each clip is not first compressed, that is, the legs 28 are not first brought together, but instead one hook 29 is slipped in place on its supporting lug l5 while the clip is expanded as shown in Fig. 4, and then the clip is compressed to bring the other hook in between the lugs, as shown by the broken lines in Fig. 9, whereupon it may be slipped over the remaining lug l5. With the clip so mounted, the loop or body portion 2! thereof is biased or under continual tension, tending to separate the legs 28 and therefore securely retaining the hooks 29 on the lugs I5, and this is of importance in that it maintains the clips on the lens against accidental dislodgment therefrom during the attachment of the device to a bulb.

As will be understood, the spacing between the arms 30 and of the clips is sufiicient to accommodate the lug thickness measured between the grooves 25 and 25 thereof, and due to the included acute angle between the said arms, and between the pairs of grooves, substantial manufacturing tolerances in the said lug thicknesses may be satisfactorily taken care of by properly proportioning the arm spacing and lug thickness. For example, if a lug of minimum thickness is made to carry a hook having a maximum arm spacing, the hook will fully accommodate the lug as shown in the right hand portion of Fig. 9. However, if a lug of maximum thickness is made to carry a hook having a. minimum arm spacing, the hook will not quite fully accommodate the lug, as shown in the left hand portion of Fig. 9. In either case I have found that the clip M will be securely and satisfactorily mounted on the lens 50, and will properly support the lens on an 7 incandescent bulb.

After the clips H have been attached to the lens iii, the device is mounted on an incandescent bulb in the following manner: The loop or body portions 27 of the clips are grasped one in each hand and spread apart, and are then slipped over the bulb envelope. Fig. 1 shows the device mounted on one of a pair of depending bulbs of a conventional table lamp. When so mounted, the loop portions 21 embrace the bulb envelope and the eifect of a ball and socket joint is had, so that the lens may be quickly and easily swung to any one of innumerable positions on the bulb, so as to direct a concentrated beam of light wherever desiredbelow the lamp shade. 1

It will be noted from Fig. 1. that a substantial air space exists between the planarsurface I3 of the lens and the bulb envelope when the device is mounted on the bub, and this is an important feature of theinvention in that it provides for 'air circulation and tends to keep the lens cool and prevent excessive heating thereof. Also, it enables the loop portions 21 of the clips H to extend along a relatively great arc of more than 270, and to therefore substantially completely embrace the bulb envelope and preclude the latter from inadvertently snapping out of place, causing the device to fall off and perhaps become broken or cause other damage. Moreover, it enables the clips to include the legs '23 which are of relatively substantial length, providing for increased resiliency in the clips and preventing possible bulb breakage which might occur if the clips were too stifi.

I have found that by the provision of a lens and clip structure as above outlined, the light intensifying device may be attachedto all the bulb sizes from 25 Watts to watts, covering the entire range encountered in'use in direct-light reading lamps, and in spite of the variation in bulb size and weight of the lens. sufiicient friction will be set up by the clips so that the lens will be held in any adjusted position without slipping therefrom. Thus the device is universally adaptable to the various bulbs in use, without requiring adjustment or resetting of the clips by the user. A further factor in enabling the legs 28 to have substantial length to provide for resiliency of the clips H is the increased length of the arms of the hooks over the length of the arms 3%; this provides for positioning the extremities of the legs 28 further from each other, and produces a softer spring action in the clips.

In accordance with the invention, for the purpose of enabling the lens attachment to be satisfactorily used in table lamps having upright bulbs, as shown in Fig. 2, to direct the concentrated light beam downwardly at a sufiiciently steep angle, the lens body l2 is provided with a deep notch or recess 33 formed in a peripheral portion thereof midway between the pairs of the lugs l5, so as to provide clearance for the neck portion 34 of the bulb. The notch 33 preferably has a sloping wall 35 of generally cylindrical curvature, to enable the bulb neck to nest in the notch and to reduce to a minimum the amount removed from the light-concentrating body 52 of the lens. Where bulbs of small wattage are used, the notch 33 in the lens body may accommodate the shell or barrel of the socket carrying the bulb, since for such small bulbs the neck portions are much shorter.

By the provision of the notch 33 in the lens body [2 the device of this invention is made practically universal in application to directlight reading lamps, since it may be used on both upright and depending bulbs, in both table and bridge lamps, and with the clip structure provided may even be used on boudoir lamps wherein a shade is being supported by wire clips embracing the bulb envelope. In this latter instance, the clips I may be slipped over the clips of the lamp shade so as to extend across the space between the shade clips, and Will be found to operate satisfactorily to support the lens it in various desired adjusted positions. The arrangement of lens and clips is such that when the device is assembled and in place on a bulb it requires but little space in addition to the bulb, and therefore may be shifted to all of its different adjusted positions without interference from shades, shade supports and the like.

Referring to Fig. 2 it will be noted that when the device is being supported on a bulb the latter tends to spread apart or expand the loop or body portions 2'! of the clips ll, thereby causing the hooks 29 thereof to be retained more tightly on the lugs I5, and in fact locking the hooks on the lugs against inadvertent removal therefrom.

The device of this invention is extremely economical to manufacture in that the component parts number only three, two of which are duplicates of each other, and in that the parts may be produced quickly and completely by single machines, that is, dropped-off a machine complete without further operations being required. Moreover, the material cost is low, since the lens may be molded of glass and the clips formed of inexpensive spring steel. A further and Very important economy is effected by the arrangement which enables the device to be supplied and merchandised in a knocked-down state, this being feasible because of the quickness and ease with which even an unskilled person may attach the clips to the lens. Therefore an assembly cost is eliminated in the production of the device, and since it occupies much less space when knocked-down, boxing costs are reduced and display problems simplified due to the possibility of the lens being mounted on a card. Also, storage and shipping space, and counter space are conserved.

It is at present preferred to proportion the lens l9 so that its peripheral diameter is on the order of 2%", and its maximum thickness on the order of A3", and these proportions have been found to be extremely advantageous in that the ensuing weight of the lens, taken with the spacing from the bulb and the strength and resiliency of the clips I I enable the device to be secured to the above-mentioned different sizes of bulbs Without readjustment, and to remain in any of the innumerable adjusted positions possible, without shifting, yet provide hi hly desirable light-intensifying properties. When it is considered that the glass surface of the bulb envelopes is very shiny and slippery, and that the glass is extremely thin and. susceptible of being crushed, and that by actual test the present device has been found to provide at least triple the original intensity of light from a single unshaded bulb with a satisfactorily large field or lighted area for practical purposes even when the field is close to the bulb, taken together with the economy of manufacture resulting from the use of glass for the lens (which material however has a relatively high specific gravity), the above proportions of the lens assume importance. Entering into the above consideration is the provision of the notch 33 in the lens body [2, which makes the device virtually uni" versal in application but detracts from the lightcollecting efficiency of the lens and reduces slightly the lens weight. I have found that the above-listed mechanical requirements are satisfactorily met by the construction described, and that when the device is in use on a lamp having a shade (which acts to an extent as a reflector) the device on the average doubles the illumination which was originally had for reading, sewing, etc. As a result of this, smaller wattage bulbs may be used, if desired, while still having the benefit of increased reading light, thereby resulting in an economy in the consumption of electricity.

The device when in use on a reading lamp does not detract to any noticeable degree from the room lighting, nor does it cast large or objectionable shadows in the room or on the lamp shade, as would be the case if a reflector were used to increase the light intensity.

In connection with the support of the clips I l on the lens Hi it should be noted that the walls of the grooves 25 and 25 in the lugs 55 act as abutments for the arms 3% and 3! of the hooks 29. That is, since most of the reactive force exerted by the bulb envelope on the two clips ll is an outward force tending to spread the clips apart from each other, the forces supplied by the lens on the clip arms, which enter the equilibrium equation, are applied by the outer walls of the grooves 25 and by the inner walls of the grooves 26, these forces being applied laterally of the said arms. The walls of the grooves opposite to those mentioned have no active function when the device is being carried by a bulb, but do function to firmly and sturdily support the clips H prior to the device being mounted fiat side 38 and a convex side 39. The lens body 3'! is preferably molded of glass, and is mounted in a metal rim til extending about the periphery thereof. In the rim 40 a pair of oppositely disposed notches M is provided, each notch having undercut portions forming a pair of opposite lugs 42 which extend toward each other. Below the notches 4| (as seen in Fig. 10) the rim has a convex portion etwhich is of annular shape.

Resilient wire clips M are provided for engagement with the lugs 42, thereby to enable the clips to be demountably secured to the lens body 31. Each clip i l comprises a pair of curved bulbengaging portions 35 carried by bent legs 45, the latter being joined with depending arms 31 connected together by a yoke or connector portion #8. The arms H extend through the notches ll and engage the edges of the lugs 42, and also engage the annular convex portion 53 of the rim All, and therefore the said edges of the lugs andconvex portion serve as abutments due to the tendencyior the bulb to swing the clips 44 outward or away from each other.

By the provision of the bent portions t may be made to extend in more nearly parallel planes, that is, the ends 4-9 of said portionsmay bespaced apart further, resulting in a .more stable clamping of the bulb envelope. l

Another modification of the invention is shown in Fig. 12. In this figure a lens so is provided, preferably molded of glass, and having molded lugs 5! similar to the lugs 42 shown in Fig. 11, but of greater thickness. Below the lugs 5| the lens 50 has a projecting abutting portion 52 functioning in the same manner as the annular portion 43 of the rim 4!) shown in Fig. 10. The clips M shown in Figs. and 11 may be used with the lens 50 of Fig. 12, being demountably at-.

tachable thereto and enabling the lens to be supported on a bulb in various adjusted positions.

Variations and modifications may be made within the scope of this invention, and portions of the improvements may be used without others.

I claim:

1. A light-intensifying attachment for an incandescent electric bulb, comprising a magnifying lens; a pair of separate and unconnected resilient loop-shaped clips, each clip having a pair of supporting legs and having hooks at the ends of the legs; and means for individually removably securing the clips to the lens in position to engage the bulb and support the lens thereon in light-intensifying relation thereto, said means including lugs on the lens, said lugs having shoulders and said hooks of the legs engaging the said lugs and shoulders thereof.

2. A light-intensifying attachment for an incandescent electric bulb, comprising a magnifying lens; a pair of separate and unconnected resilient loop-shaped clips, each clip having a pair of supporting legs and having hooks at the ends of the legs; and means for individually removably securing the clips to the lens in position to engage the bulb and support the lens thereon in light-intensifying relation thereto, said means including lugs on the lens, said lugs having oppositely-located grooves, and said hooks of the legs legs 3%; the clip '10 occupying said grooves and engaging the said lugs.

3. A light-intensifier attachment for an incandescent electric bulb, comprising a magnifying lens having lugs on its periphery, each lug being provided with a pair of elongate grooves in its opposite sides, extending generally in the same directions; resilient clips for mounting the lens on a bulb; and means removably mounting the clips on said lugs for support thereby in position to engage opposite sides of the bulb and hold the lens thereto in spaced, light-intensifying relation, said clip-mounting means including spaced portions on said clips, extending along the grooves of the lugs and engaging the walls of said grooves.

4. A light-intensifier attachment. for an incandescent electric bulb,- comprising a magnifying lens having peripheral mounting portions, each of said portions having opposite exterior sides and abutments on said sides; separate resilient clips for mounting the lens on a bulb; and means removably mounting the clips on said portions for sole support thereby in position to engage opposite sides of the bulb and hold the lens in spaced light-intensifying relation thereto, said clip-mounting means including spaced parts of said clips, extending along said opposite exterior sides of the said lens mounting portions and engaging the abutments thereof, to retain the clips in place.

5. A light-intensifier attachment for an incandescent electric bulb, comprising a magnifying lens having a notch in its periphery and having peripheral mounting portions on opposite sides of said notch, each of said portions having opposite exterior sides and abutments on said sides; resilient clips for mounting the lens on a bulb; and means removably mounting the clips on said mounting portions for support thereby in position to engage opposite sides of the bulb and hold the lens in spaced light-intensifying relation thereto, said clip-mounting means including spaced parts of said clips, extending along said opposite sides of the lens mounting portions and engaging the abutments thereof, said clips enabling the lens to be shifted to different angular positions on the bulb and said notch providing clearance for the neck of the bulb to enable the lens to direct light past the base of the bulb.

6. A light-intensifying attachment for an electric bulb, comprising a magnifying lens having a generally concave re-entrant notch in an edge portion, said notch being shaped to enable it to receive and partially encircle the neck portion of the bulb; and means including opposed clips for attaching the lens to the bulb for swinging, arcuate adjustment to different angular positions thereon along a predetermined arc, said notch being disposed in a zone midway between the clips of the attaching means so that the center of the notch substantially coincides with the said are or its extension for different adjusted positions of the lens, said attaching meansthereby enabling the notch to provide clearance for the neck of the bulb when the lens is shifted to a position for directing light pass the bulb base at a relatively small acute angle to the longitudinal axis of the bulb.

7. A light-intensifier attachment for an incandescent electric bulb, comprising a magnifying lens; and a pair of opposed resilient loops secured to the lens for supporting the same on the bulb in difierent angular adjusted positions,

said lens having a generally concave inwardly extended peripheral notch located in a portion of the lens disposed substantially midway between the planes of the loops when the latter are held parallel, said notch being so positioned and curved as to extend partially around the neck of the bulb and provide clearance for the bulb when the lens is shifted to a position directing light past the bulb base at a relatively small acute angle to the longitudinal axis of the bulb.

8. A light-intensifier attachment for an incandescent electric bulb, comprising a magnifying lens having mounting portions each of which has an obverse and a reverse side and each of which portions has a pair of grooves disposed respectively in said sides, the axes of the grooves of each pair being divergent with respect to one another; and resilient clip means removably secured to said mounting portions for mounting the lens on a bulb in light-intensifying relation thereto, said clip means including hooks and each hook having divergent portions respectively occupying the grooves of a pair, the hooks being urged by said clip means against the grooved lens portions and the divergency of the hook portions and grooves being complementary to minimize the looseness of the clip means on the lens.

9. A light-intensifier attachment for an incandescent electric bulb, comprising a magnifying lens; a pair of separate, unconnected and independent, opposed resilient clips, each clip having bulb-gripping portions shaped to engage and extend along the bulb envelope and nest the same, and having mounting legs joined to said portions and extending angularly therefrom in a direction away from said envelope; and cooperable means on said lens and legs for detachably mounting the legs on the lens to support the clips thereby, said clips being adapted to be spread apart angularly to hold the lens on the bulb in light intensifying relation thereto, said angularly extending legs providing for spacing of the lens from the bulb, and said cooperable means including pairs of spaced abutments on the lens, and including spaced obverse and reverse portions on the legs, respectively engaging said abutments.

10. The invention as defined in claim 9, in which the engaged surfaces of the abutments lie in planes which make small acute angles with the axis of the lens.

HERBERT G. LE HMANN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 794,296 Gille July 11, 1905 852,121 Kelley Apr, 30, 1907 945,356 Wilson Jan. 4, 1910 1,548,294 Wilkinson Aug. 4, 1925 1,766,696 Stallings June 24, 1930 1,880,893 Dodge Oct. 4, 1932 2,087,749 Bookman July 20, 1937 2,103,322 Sherbinin Dec. 28, 1937 2,187,071 Bergmans Jan. 16, 1940 2,202,590 Korengold May 28, 1940 

